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Hemisphere:  Southern  ·  Contains:  Little Gem, NGC 6440, NGC 6445
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NGC6440 & the Box Nebula, 



    
        

            AlBroxton
NGC6440 & the Box Nebula
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NGC6440 & the Box Nebula

Technical card

Imaging telescopes or lenses: Celestron C11 Celestron

Imaging cameras: 60Da Canon  ·  40D Canon

Guiding telescopes or lenses: 80mm EON Orion

Focal reducers: 6.3 reducer Celestron

Software: Deep Sky Stacker  ·  Noel's Tools  ·  5.00 Images Plus


Dates:June 3, 2011

Frames: 26x69"

Integration: 0.5 hours

Avg. Moon age: 1.59 days

Avg. Moon phase: 2.82%


Basic astrometry details

Astrometry.net job: 3442679

RA center: 17h 48' 55"

DEC center: -20° 21' 36"

Pixel scale: 2.358 arcsec/pixel

Orientation: 48.656 degrees

Field radius: 0.387 degrees


Resolution: 983x656

Description

NGC6440 although relatively near to the Sun at 20 000 light years, this globular cluster shines through about 4 magnitudes of interstellar absorption, so that it appears small and obscure in the Sagittarius star clouds.  It sits 2.3° south-west of M 23 and 4.1° north-west of M 20 (the Trifid Nebula). Discovered in 1784 by William Herschel.
Observation Notes : is a rich globular cluster, pretty bright, pretty small and much brighter in the middle. It had ragged edges with 10 stars resolved.

Comments

Author

AlBroxton
AlBroxton
License: None (All rights reserved)
5024
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Revisions

  • NGC6440 & the Box Nebula, 



    
        

            AlBroxton
    Original
  • NGC6440 & the Box Nebula, 



    
        

            AlBroxton
    B
  • NGC6440 & the Box Nebula, 



    
        

            AlBroxton
    C
  • Final
    NGC6440 & the Box Nebula, 



    
        

            AlBroxton
    D

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Sky plot

Histogram

NGC6440 & the Box Nebula, 



    
        

            AlBroxton